CN112355093A - Universal horizontal frame forming structure of stainless steel pipe making machine - Google Patents
Universal horizontal frame forming structure of stainless steel pipe making machine Download PDFInfo
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- CN112355093A CN112355093A CN202011215295.6A CN202011215295A CN112355093A CN 112355093 A CN112355093 A CN 112355093A CN 202011215295 A CN202011215295 A CN 202011215295A CN 112355093 A CN112355093 A CN 112355093A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
- B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
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Abstract
The invention discloses a universal horizontal frame forming structure of a stainless steel pipe making machine, which comprises a horizontal frame main body, a horizontal roller assembly, two side roller assemblies and a translation driving assembly, wherein the horizontal roller assembly comprises a horizontal die roller arranged on the horizontal frame main body, the two side roller assemblies are symmetrically arranged on two sides of the horizontal roller assembly, each side roller assembly comprises a sliding seat, a sliding block, a rotating block, a vertical die roller, a lifting adjusting mechanism and a rotation adjusting mechanism, the lifting adjusting mechanism is arranged for enabling the sliding block to move along a Z axis relative to the sliding seat, the rotating block is rotatably arranged on the sliding block, the rotating block is provided with a rotating axis extending along the Y axis, the rotation adjusting mechanism is used for enabling the rotating block to rotate around the rotating axis, and the vertical die roller is arranged on the rotating block; the translation driving assembly is used for enabling the two sliding seats to move towards or away from the lying frame main body in the X axis. The invention can make the forming pressure of the two vertical die rollers and the horizontal die roller to the pipe more uniform, and meet the forming processing of the pipes with different specifications.
Description
Technical Field
The invention relates to the technical field of stainless steel pipe production equipment, in particular to a universal horizontal frame forming structure of a stainless steel pipe making machine.
Background
Stainless steel pipes are widely used in many fields such as electric power, machinery, building, home decoration and the like because of light weight, firm structure and good stress performance. Due to different requirements on the use size and the wall thickness of the stainless steel pipe fittings in different application occasions, the requirements on the specification, the size, the structure and the specification of a die roller of the stainless steel pipe machine are more and more in the production process. The prior stainless steel pipe machine has the following defects and shortcomings in the production process: the position between the die rollers is not flexibly adjusted, the reasonable stress points of the die rollers are not easy to adjust, the die rollers are quickly abraded and cannot bear overlarge forming force, the debugging difficulty is high, and the work experience of adjusting the machine by workers is high.
Disclosure of Invention
The invention aims to provide a universal horizontal frame forming structure of a stainless steel pipe making machine, which is used for solving one or more technical problems in the prior art and at least provides a beneficial choice or creation condition.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a omnipotent frame shaping structure that crouches of stainless steel pipe making machine, its X axle, Y axle, the Z axle that has mutual quadrature, the omnipotent frame shaping structure that crouches of stainless steel pipe making machine includes: crouch a main part, horizontal roller subassembly, two side roller subassemblies, translation drive assembly, horizontal roller subassembly includes that the axis is along the horizontal mould roller of X axle extension, horizontal mould roller can be fixed in crouching a main part around self axis rotation, and two side roller subassemblies are the interval along the X axle and set up in crouching a main part, two side roller subassemblies are the symmetry and set up in the both sides of horizontal roller subassembly, side roller subassembly includes sliding seat, slider, rotatory piece, founds the mould roller, lift adjustment mechanism, rotation adjustment mechanism, the slider slidable sets up on the sliding seat, lift adjustment mechanism be provided with the slider transmission is connected and make the slider is along the lift drive end of Z axle removal for the sliding seat, rotatory piece rotationally installs on the slider, rotatory piece is provided with the rotation axis of extending along the Y axle, rotation adjustment mechanism be provided with rotatory piece transmission connection, The rotating block is driven by a rotating driving end which rotates around the rotating axis, the axis of the vertical mold roller is perpendicular to the Y axis, the vertical mold roller is arranged on the rotating block, and the two vertical mold rollers are oppositely arranged in the X axis direction; the translation driving component is provided with a translation driving end which is in transmission connection with the two sliding seats and enables the two sliding seats to move towards or away from the lying frame body on the X axis.
It should be noted that: the X, Y, and Z axes orthogonal to each other are virtual features, and are provided for convenience of description of positions between the respective components.
The invention has the beneficial effects that: when the pipe blank forming machine is used, the pipe blank is conveyed along the Y axis and conveyed between the two vertical die rollers and the horizontal die roller, and pressure is applied to pipe forming in three directions through the two vertical die rollers and the horizontal die roller simultaneously, so that the pipe forming processing is realized; when pipes with different outer diameters need to be formed, the translation driving end on the translation driving assembly drives the two sliding seats to move in the X axis direction or move in the opposite direction, so that the relative positions of the two vertical mold rollers in the X axis direction can be adjusted, the lifting driving end on each lifting adjusting mechanism drives the corresponding sliding block to move in the Z axis direction, the relative positions of the two vertical mold rollers and the horizontal mold roller in the Z axis direction are adjusted, meanwhile, the rotating driving end on each lifting adjusting mechanism can be rotated to drive the rotating block to rotate around the rotating axis, the rotating axis extends along the Y axis, so that the positions of the two vertical mold rollers can be adjusted on the XZ axis surface, and the positions of the two vertical mold rollers which are abutted against the peripheral surface of the pipe are adjusted, so that the forming pressure of the two vertical mold rollers and the horizontal mold roller on the pipe is more uniform, and the pulling damage and friction of a steel strip on the mold rollers are, therefore, the maintenance cost is reduced, the forming processing of pipes with different specifications is met, the workload of manual debugging is reduced, the debugging time of workers is reduced, and the production efficiency is improved.
As a further improvement of the above technical solution, the translation driving assembly includes a bidirectional lead screw and two nut seats, the bidirectional lead screw extends along an X axis, the bidirectional lead screw is rotatably fixed on the horizontal frame body, the bidirectional lead screw is provided with a first thread section and a second thread section, which have opposite thread turning directions, the number of the nut seats is two, the two nut seats are respectively in thread transmission connection with the first thread section and the second thread section, and the two nut seats are respectively fixedly connected with the two sliding seats.
When the relative positions of the two vertical die rollers in the X-axis direction need to be adjusted, the two-way screw rod can be rotated, the two sliding seats can be driven to move in the X-axis direction or in the back direction relative to the lying frame main body under the transmission of the first thread section and the second thread section with opposite thread turning directions and the threads of the two nut seats respectively, the adjustment accuracy can be improved through the thread matching of the two-way screw rod and the nut seats, and the self-locking function is achieved.
As a further improvement of the above technical solution, the lying frame main body is provided with a sliding groove extending along an X axis, and the two sliding seats are slidably connected with the sliding groove.
Two sliding seats and sliding tray sliding fit can improve the stability and the smoothness nature that the sliding seat removed.
As a further improvement of the above technical solution, the lifting adjustment mechanism includes a lifting screw rod extending along the Z axis, the lifting screw rod is rotatably fixed on the sliding seat, the slider is slidably connected with the sliding seat, and a threaded hole in threaded transmission connection with the lifting screw rod is provided on the slider.
When the position of the vertical mold roller in the Z axial direction needs to be adjusted, the corresponding lifting screw rod is rotated, the sliding block can be driven to move upwards in the Z axial direction relative to the sliding seat under the thread transmission of the lifting screw rod and the threaded hole, the corresponding vertical mold roller is driven to move, and the accuracy of adjustment of the vertical mold roller can be improved through the thread matching of the lifting screw rod and the threaded hole.
As a further improvement of the above technical solution, the rotation adjustment mechanism includes a worm and a worm wheel, the worm is rotatably fixed on the slider, the worm wheel uses the rotation axis as a center of circle, the worm wheel is fixed on the rotation block, and the worm is in threaded transmission connection with the worm wheel.
When the position of the mould roller is required to be rotated, the worm is rotated, the worm and the worm wheel are in threaded transmission, the rotating block is driven to rotate around the rotating axis, the mould roller can be driven to rotate around the rotating axis, and the position of collision between the mould roller and the peripheral wall of the pipe on the circumference is adjusted.
As a further improvement of the above technical solution, the sliding block is fixedly connected with a rotary guide seat, the rotary guide seat is provided with an arc guide rail using the rotation axis as a center of circle, and the rotary block is slidably connected with the arc guide rail.
When the rotating position of the vertical mold roller is adjusted, the rotating block can rotate along the arc guide rail, and the rotating stability of the rotating block is improved.
As a further improvement of the technical scheme, the axis of the vertical mold roller is crossed and vertical to the rotating axis.
This can ensure that the periphery of founding the mould roller evenly contradicts with the periphery wall of tubular product, improves fashioned quality.
As a further improvement of the technical scheme, a connecting rod which can be contracted and fixed is connected between the two sliding seats and extends along the X axis. The connecting rod can offset the reaction force of the two vertical die rollers during pipe forming, and the structural strength between the two sliding seats is improved.
As a further improvement of the technical scheme, the horizontal roller assembly comprises a mounting seat fixed on the top of the lying frame main body, and the horizontal die roller is rotatably mounted on the mounting seat through a horizontal shaft.
As a further improvement of the technical scheme, the vertical die roller is rotatably arranged at the inner end of the rotating block through a vertical shaft, and the outer end of the rotating block is rotatably connected with the sliding block. This can make two vertical mould rollers keep relative setting, avoids other parts to touch tubular product and lead to the damage.
Drawings
The invention is further described with reference to the accompanying drawings and examples;
FIG. 1 is a schematic structural view of an embodiment of a universal horizontal frame forming structure of a stainless steel tube making machine provided by the invention;
FIG. 2 is an exploded view of one embodiment of the translational drive assembly and the carriage body of the present invention;
FIG. 3 is an exploded view of one embodiment of a side roller assembly provided by the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if words such as "a plurality" are described, the meaning is one or more, the meaning of a plurality is two or more, more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 3, the universal horizontal frame forming structure of the stainless steel tube making machine of the present invention is made as follows:
the universal horizontal frame forming structure of the stainless steel pipe making machine comprises a horizontal frame main body 100, a horizontal roller assembly 200, two side roller assemblies 300 and a translation driving assembly.
The horizontal roller assembly 200 comprises a mounting seat 220 fixed on the top of the lying frame main body 100 and a horizontal roller 210 with an axis extending along the X axis, the horizontal roller 210 is rotatably mounted on the mounting seat 220 through a horizontal shaft, two side roller assemblies 300 are arranged on the lying frame main body 100 at intervals along the X axis, the two side roller assemblies 300 are symmetrically arranged on two sides of the horizontal roller assembly 200, and the side roller assembly 300 of the embodiment comprises a sliding seat 310, a sliding block 320, a rotating block 330, a vertical roller 340, a lifting adjusting mechanism and a rotating adjusting mechanism.
Wherein a sliding groove 110 extending along the X axis is provided on the bed main body 100, the lower ends of the two sliding seats 310 are slidably connected with the sliding groove 110, and the translational driving assembly is used for moving the two sliding seats 310 towards or away from each other on the X axis relative to the bed main body 100, specifically: the translation driving assembly comprises a bidirectional screw rod 400 and two nut seats 410, the bidirectional screw rod 400 extends along an X axis, the bidirectional screw rod 400 is rotatably fixed on the horizontal frame main body 100, the bidirectional screw rod 400 is provided with a first thread section and a second thread section, the thread turning directions of the first thread section and the second thread section are opposite, the number of the nut seats 410 is two, the two nut seats 410 are respectively in thread transmission connection with the first thread section and the second thread section, and the two nut seats 410 are respectively in fixed connection with the two sliding seats 310.
And the sliding block 320 is slidably disposed on the sliding seat 310, and the lifting adjustment mechanism in this embodiment is configured to enable the sliding block 320 to move along the Z axis relative to the sliding seat 310, specifically: the lifting adjusting mechanism comprises a lifting screw 350 extending along the Z axis, the lifting screw 350 is rotatably fixed on the sliding seat 310, a threaded hole in threaded transmission connection with the lifting screw 350 is formed in the sliding block 320, and the lifting screw 350 can be rotated to drive the sliding block 320 to move in the Z axis direction relative to the sliding seat 310 under the threaded transmission of the lifting screw 350 and the threaded hole.
The rotation block 330 in this embodiment is provided with a rotation axis extending along the Y-axis, and the rotation block 330 is rotatably mounted on the slider 320 around the rotation axis, specifically: the sliding block 320 is fixedly connected with a rotary guide seat 380, the rotary guide seat 380 is provided with an arc guide rail 381 taking the rotation axis as the center of a circle, the outer end of the rotary block 330 is connected with the arc guide rail 381 in a sliding mode, the vertical mold roller 340 is rotatably installed at the inner end of the rotary block 330 through a vertical shaft, the axis of the vertical mold roller 340 is perpendicular to the Y axis, and therefore the two vertical mold rollers 340 are oppositely arranged in the X axis direction. And the rotation adjusting mechanism is mainly used for rotating the rotating block 330 around the rotation axis, specifically: rotatory adjustment mechanism includes worm 360, turbine 370, worm 360 rotationally is fixed in on the slider 320, turbine 370 uses the axis of rotation is the centre of a circle, turbine 370 is fixed in on rotatory piece 330, worm 360 and turbine 370 screw thread transmission are connected, and when the position of rotatory upright mould roller 340 of needs, rotate worm 360, under the screw thread transmission of worm 360 and turbine 370, drive rotatory piece 330 and wind the axis of rotation rotates, and then can drive upright mould roller 340 and wind the axis of rotation rotates, adjusts upright mould roller 340 and the conflict position of tubular product periphery wall on the circumference.
When the pipe blank forming machine is used, the pipe blank is conveyed along the Y axis and conveyed to a position between the two vertical die rollers 340 and the horizontal die roller 210, at the moment, the horizontal die roller 210 can keep supporting the pipe blank, the pipe blank is prevented from inclining in the horizontal direction in the forming process, the pipe blank can be kept on a set horizontal plane to be conveyed, the forming resistance is reduced, and the pipe blank forming machine can apply pressure to the pipe blank in three directions through the two vertical die rollers 340 and the horizontal die roller 210 simultaneously, so that the pipe blank forming processing is realized.
When pipes with different outer diameters need to be formed, the two-way screw rod 400 can be rotated to drive the two sliding seats 310 to move in the X axis direction or in the back direction relative to the lying frame main body 100 under the transmission of the first thread section and the second thread section with opposite thread turning directions and the threads of the two nut seats 410 respectively, so that the relative positions of the two vertical mold rollers 340 in the X axis direction can be adjusted; the corresponding lifting screw rods 350 can be rotated, and under the screw transmission of the lifting screw rods 350 and the threaded holes, the sliding blocks 320 can be driven to move in the Z-axis direction relative to the sliding seats 310, so that the corresponding vertical mold rollers 340 are driven to move in the Z-axis direction, namely, the relative positions of the two vertical mold rollers 340 and the horizontal mold roller 210 in the Z-axis direction are adjusted; and still can be through rotating worm 360, under the screw drive of worm 360 and turbine 370, drive rotatory piece 330 and wind the rotation axis rotates, and then can drive upright mould roller 340 around the rotation axis rotates, adjust the position that two upright mould rollers 340 contradict with the global of tubular product, so can make two upright mould rollers 340 and horizontal mould roller 210 more even to the shaping pressure of tubular product, reduce the steel band to the strain and the friction of mould roller, thereby reduce cost of maintenance, the shaping processing that satisfies different specification tubular products, reduce artifical debugging work load, reduce workman's debugging time, thereby improve production efficiency.
The installation of two-way lead screw 400, lift lead screw 350 and worm 360 in this embodiment all is provided with rolling bearing to all the cover is equipped with the swivel nut, the workman's operation of being convenient for.
Further, the axis of the vertical mold roller 340 is perpendicular to the rotation axis, which can ensure that the periphery of the vertical mold roller 340 is evenly abutted against the peripheral wall of the pipe, and the molding quality is improved.
And a connecting rod 390, which is capable of being extended and contracted and fixed, is connected between the two sliding seats 310, and the connecting rod 390 is extended along the X-axis. The connecting link 390 can counteract the reaction force of the two vertical mold rollers 340 during the tube forming process, and improve the structural strength between the two sliding seats 310.
In some embodiments, the lifting adjustment mechanism may employ other lifting driving structures, such as: the precision that opposition die roller 340 adjusted can be improved to linear hydraulic cylinder, straight line cylinder, sharp electric putter etc. through the screw-thread fit of lift lead screw 350 with the screw hole to this embodiment.
In some embodiments, the rotation adjustment mechanism may adopt other rotation driving structures, for example, a rotation motor may drive the rotation block 330 to rotate, and the like, and the rotation connection between the rotation block 330 and the sliding block 320 may adopt a connection manner of a rotating shaft, and the like.
In some embodiments, the translation driving assembly may also adopt other linear driving structures, for example, two linear driving units may be adopted to respectively drive the two sliding seats 310 to move.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (10)
1. The utility model provides a omnipotent frame forming structure that crouches of stainless steel pipe tuber which characterized in that: the universal horizontal frame forming structure of the stainless steel pipe making machine is provided with an X axis, a Y axis and a Z axis which are mutually orthogonal, and comprises:
a lying frame main body (100);
the horizontal roller assembly (200) comprises a horizontal roller (210) with an axis extending along the X axis, and the horizontal roller (210) is fixed on the lying frame main body (100) in a manner of rotating around the axis of the horizontal roller;
side roller assembly (300), its quantity is two, and two side roller assembly (300) are the interval along the X axle and set up on crouching a main part (100), two side roller assembly (300) are the symmetry and set up in the both sides of horizontal roller assembly (200), side roller assembly (300) are including sliding seat (310), slider (320), rotatory piece (330), upright mould roller (340), lifting adjusting mechanism, rotation adjusting mechanism, slider (320) set up on sliding seat (310) slidable, lifting adjusting mechanism be provided with slider (320) transmission connection makes slider (320) for sliding seat (310) along the lift drive end of Z axle removal, rotatory piece (330) rotationally install on slider (320), rotatory piece (330) is provided with the rotation axis that extends along the Y axle, rotation adjusting mechanism be provided with rotatory piece (330) transmission connection connects, A rotary driving end which enables the rotary block (330) to rotate around the rotary axis, the axis of the vertical mold roller (340) is perpendicular to the Y axis, the vertical mold roller (340) is arranged on the rotary block (330), and the two vertical mold rollers (340) are oppositely arranged in the X axis direction;
the translation driving assembly is provided with a translation driving end which is in transmission connection with the two sliding seats (310) and enables the two sliding seats (310) to move towards or away from each other on the X axis relative to the lying frame main body (100).
2. The universal horizontal frame forming structure of the stainless steel pipe making machine according to claim 1, wherein:
translation drive assembly includes two-way lead screw (400), nut seat (410), two-way lead screw (400) extend along the X axle and set up, two-way lead screw (400) rotationally are fixed in on crouching a main part (100), two-way lead screw (400) are provided with the first screw thread section and the second screw thread section that the screw thread revolves to opposite, the quantity of nut seat (410) is two, two nut seat (410) are connected with first screw thread section and second screw thread section screw transmission respectively, two nut seat (410) respectively with two sliding seat (310) fixed connection.
3. The universal horizontal frame forming structure of the stainless steel pipe making machine according to claim 1, wherein:
the lying frame main body (100) is provided with a sliding groove (110) extending along an X axis, and the two sliding seats (310) are connected with the sliding groove (110) in a sliding mode.
4. The universal horizontal frame forming structure of the stainless steel pipe making machine according to claim 1, wherein:
the lifting adjusting mechanism comprises a lifting screw rod (350) extending along the Z axis, the lifting screw rod (350) is rotationally fixed on the sliding seat (310), the sliding block (320) is in sliding connection with the sliding seat (310), and a threaded hole in threaded transmission connection with the lifting screw rod (350) is formed in the sliding block (320).
5. The universal horizontal frame forming structure of the stainless steel pipe making machine according to claim 1, wherein:
the rotation adjusting mechanism comprises a worm (360) and a worm wheel (370), the worm (360) is rotationally fixed on the sliding block (320), the worm wheel (370) takes the rotation axis as the center of a circle, the worm wheel (370) is fixed on the rotating block (330), and the worm (360) is in threaded transmission connection with the worm wheel (370).
6. The universal horizontal frame forming structure of the stainless steel pipe making machine according to claim 1, wherein:
the slider (320) fixedly connected with rotatory guide holder (380), rotatory guide holder (380) are provided with and use rotation axis is circular arc guide rail (381) of centre of a circle, rotatory piece (330) with circular arc guide rail (381) sliding connection.
7. The universal horizontal frame forming structure of the stainless steel pipe making machine according to claim 1, wherein:
the axis of the vertical mold roller (340) is perpendicular to the rotation axis in a crossing manner.
8. The universal horizontal frame forming structure of the stainless steel pipe making machine according to claim 1, wherein:
a connecting rod (390) which can be contracted and fixed is connected between the two sliding seats (310), and the connecting rod (390) is arranged in an extending way along the X axis.
9. The universal horizontal frame forming structure of the stainless steel pipe making machine according to claim 1, wherein:
the horizontal roller assembly (200) comprises a mounting seat (220) fixed on the top of the lying frame main body (100), and the horizontal roller assembly (210) is rotatably mounted on the mounting seat (220) through a horizontal shaft.
10. The universal horizontal frame forming structure of the stainless steel pipe making machine according to claim 1, wherein:
the vertical mold roller (340) is rotatably arranged at the inner end of the rotating block (330) through a vertical shaft, and the outer end of the rotating block (330) is rotatably connected with the sliding block (320).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011215295.6A CN112355093A (en) | 2020-11-04 | 2020-11-04 | Universal horizontal frame forming structure of stainless steel pipe making machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011215295.6A CN112355093A (en) | 2020-11-04 | 2020-11-04 | Universal horizontal frame forming structure of stainless steel pipe making machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112355093A true CN112355093A (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011215295.6A Withdrawn CN112355093A (en) | 2020-11-04 | 2020-11-04 | Universal horizontal frame forming structure of stainless steel pipe making machine |
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| CN (1) | CN112355093A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113695434A (en) * | 2021-08-20 | 2021-11-26 | 石家庄中泰制管技术开发有限公司 | Steel pipe precision forming device |
-
2020
- 2020-11-04 CN CN202011215295.6A patent/CN112355093A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113695434A (en) * | 2021-08-20 | 2021-11-26 | 石家庄中泰制管技术开发有限公司 | Steel pipe precision forming device |
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Application publication date: 20210212 |